Refer to signal multiplexing information for this MCU for more details.Table 26-1. OSC Signal DescriptionsSignal Description I/OEXTAL External clock/Oscillator input IXTAL Oscillator output O26.5 External Crystal / Resonator ConnectionsThe connections for a crystal/resonator frequency reference are shown in the figuresfound here.When using low-frequency, low-power mode, the only external component is the crystalor ceramic resonator itself. In the other oscillator modes, load capacitors (Cx, Cy) andfeedback resistor (RF) are required. The following table shows all possible connections.Table 26-2. External Caystal/Resonator ConnectionsOscillator Mode ConnectionsLow-frequency (32 kHz), low-power Connection 1Low-frequency (32 kHz), high-gain Connection 2/Connection 31High-frequency (3~32 MHz), low-power Connection 1/Connection 32,2High-frequency (3~32 MHz), high-gain Connection 2/Connection 321. When the load capacitors (Cx, Cy) are greater than 30 pF, use Connection 3.2. With the low-power mode, the oscillator has the internal feedback resistor RF. Therefore, the feedback resistor must not beexternally with the Connection 3.OSCEXTALCrystal or ResonatorVSSXTALFigure 26-2. Crystal/Ceramic Resonator Connections - Connection 1Chapter 26 Oscillator (OSC)K22F Sub-Family Reference Manual, Rev. 4, 08/2016NXP Semiconductors 579
